Preparation And Properties Of Copper Based Catalysts Applied In Heterogeneous Catalytic Oxidation Of Organic Dye Waste Water

Organic dye wastewater contains many kinds of biological toxicity or other organic compounds, which has a great impact on the environment and difficult to degrade by the conventional methods. Therefore, the treatment of organic dye wastewater has become a hotspot in the research of the water pollution control engineering. Among various kinds of methods, heterogeneous catalytic oxidation technology has some advantages, such as high activity, good stability and easy to separate. This paper uses a simple hydrothermal method or a novel hydrogen peroxide with aging prepared different shapes of copper based catalysts (CU2PO4OH, Cu5(PO4)2(OH)4, CuO). Through systematically inspect the ratio of reactants and reaction temperature (or aging temperature) influences on the products. The synthesis of controllable and its growth mechanism of the structure for various morphologys copper based catalysts have been studied and further discussed the catalytic performance. The main research work is embodied in the following four aspects:(1) A pure phase of orthogonal CU2PO4OH crystals has been successfully prepared by simple hydrothermal routes. By means of XRD and SEM analysis methods, the scope of the process parameters to prepared various morphology of CU2PO4OH crystals have been received. The different morphology of CU2PO4OH crystals can be affected with the construction, the anisotropy of crystal growth and electrostatic field which caused by the crystal nucleus surface adsorption of OH’. The products had been used for the catalytic degradation of different dyes to research its catalytic property and found the dumbbell shape structure of crystal possessed of more excellent performance than others. Catalyst for dyes has certain selectivity to the catalytic degradation, and the direct brown MM is the most excellent.(2)A pure phase of triclinic Cus(PO4)2(OH)4 crystals have been successfully prepared by simple hydrothermal routes. Also by means of XRD and SEM analysis methods, the synthesis of Cus(PO4)2(OH)4 crystal need smaller copper/phosphorus mole ratio and higher hydrothermal temperature than CU2PO4OH crystal. The Cus(PO4)2(OH)4 crystal have different morphologies, such as spheres, spheres-like and dendritic shape. The different morphology of Cu5(PO4)2(OH)4 crystals also attributed to the construction and the adsorption of OH", but the higher concentration of OH" resulted the isotropic of crystal growth and stronger electrostatic field of force. In this paper, Cus(PO4)2(OH)4 crystal used as catalyst in the catalytic oxidation reaction for the first time and have better performance than Cu2PO4OH crystal. Spherical Cu5(PO4)2(OH)4 crystal which make small flake have the best performance in all the different morphology Cus(PO4)2(OH)4 crystals. Catalyst for dyes has certain selectivity to the catalytic degradation, and the direct brown MM is the most excellent.(3) A pure phase of orthogonal Cu2PO4OH crystals have been successfully prepared by a novel hydrogen peroxide with aging. Hydrogen peroxide used in the Cu2PO4OH crystals preparation process for the first time and Cu2PO4OH crystals can be prepared directly without heating. Subsequent aging treatment is order to obtain good crystallinity and pure phase Cu2PO4OH crystals. In this novel synthetic route, the products are different regularity bundle Cu2PO4OH crystals, and the size is far less than Cu2PO4OH crystals which prepared by hydrothermal routes. Because of the small size for the bundle Cu2PO4OH crystals then the larger specific surface area showed excellent performance in the process of catalytic oxidation, its reaction rate constants for degradation of rhodamine B more than twice the hydrothermal routes. Catalyst for dyes has certain selectivity to the catalytic degradation, and the direct brown MM is the most excellent.(4) A pure phase of monoclinic nano CuO crystals have been successfully prepared by a novel hydrogen peroxide with aging. Hydrogen peroxide used in the nano CuO crystals preparation process for the first time and the pure phase nano CuO crystals can be prepared directly without heating. Subsequent aging treatment is order to obtain good crystallinity and uniformly flower-like nano CuO crystals. Because of flower-like nano CuO crystals have good catalytic activity and smaller nano size, so its have excellent catalytic performance in the process of catalytic oxidation, its reaction rate constants for degradation of rhodamine B more than four times for commercial CuO powder. Catalyst for dyes has certain selectivity to the catalytic degradation, and the direct brown MM is the most excellent.